I had a major update this morning (Win 10, I do it manually so others probably had gotten it days ago)
Since then I get the handshake error. I’ve tried every suggestion I found through google.
cleared cache
cleared settings
removed accounts and readded them
synched time
uninstalled, removed all EVE related data and reinstalled
waited till after downtime
Still nothing. I disabled the firewall, the traceroute works fine, checked for more windows updates, checked integrity with scf /scannow. I …

hey,
I also got this problem. After some time dilation on the test server, I flew some abyssal sites, then suddenly I disconnected from the server and when I tried to reconnect I got the Handshake error. After 30 min trying to reconnect I found this posts. I tried a few things and the only one working for me is to pin and unpin your added acc. If I try to start the client while it is pined it gives me the error and as soon as I unpin it works again.
Also, I have Win 7 and haven’t updated this PC for a long time so it hasn’t necessarily to do with the win 10 update.
I also think this error kind kicked me from the server.

Suddenly encountered the problem on the test server, even though I could log on tranquility just fine. Tried everything mentioned in this thread except for clearing the cache, because I was afraid that it would reset all my windows and other client settings.

Found a work around by clicking the “E” in the top right corner, and selecting “Server List”. I then clicked on play on Singularity. I had to manually enter in my credentials, and wait for the acquiring bulk data thing, but I was able to get in.

Update: When I tried logging in the next day, I found that the problem had resolved itself, and that I could now login normally.

I just had this problem while running 12 accounts at the same time. Randomly, 1 of my accounts was disconnected and now unable to connect. I’ve tried removing the account from the launcher and adding it again, but no luck.

God CCP your server infrastructure just SUCKS big time. Your lousy software tells me I would have no internet connection while 2 other accounts are logged in at the same time. Good god fix that ■■■■ already.